Tire gauge



l. PULVERMAN.

TIRE GAUGE.

APPLICATION FILED MAY 29, 1920.

Patented Feb. 7 1922.

Q s.. x v

ISIDORE PULVERMAN', 0F WARREN, PENNSYLVANIA.

' TIRE GAUGE.

^ Application led May 29,

To all whom t may concern.'

Be it known that I, IsIDonE PULVERMAN, a. citizen of the'United States,residi at Warren, in the county of Warren and tate of Pennsylvania,havel invented new and u seful Improvements in Tire Gauges, of which thefollowing is al spec1ficat1on.

This invention relates particularly to structural features of a tirepressure gauge adding to the durability and strength of the completeddevice and convemence 1n manufacture.

The invention is illustrated 1n the accompanying drawings as follows iFig. 1 shows an elevation of the device 1n a section of rim and tire. l

Fig. 2 a central section of the device somewli'at enlarged from Flg. 1.

Fig. 3 a plan view of a flanged nipple .for expanding the lower end ofthe expans1on tube.

l marks the stem. This is a hollow stem extending from the tire tube outthrough the felloe'of the wheel and on which the inflation valve ismounted. In the present construction this stem is screw-threaded fromend to end with a continuous screw thread thus very much simplifying themanufacture of the stem. A head 2 'has a screw.

threaded opening 2a extending through it of a' diameter and pitch toscrew on to the threads on the stem 1. A clamping washer 3 is adapted toengage the tube 7, the -washer having an annular groove 4 to recelve theedges of theopening through the tube and the washer and head havmg atongue 5- and groove 6 respectively for making a more secure jointbetween the stem or head and the tube. The usual supportlng plate 1sprovided back of the washer 3 and a clamping nut is arranged on thescrew threads of the stem clamping the plate 8 and washer 3 in position.An inflation valve 10 1 s arranged in a removable seat 11 of ordinaryconstruction and is secured in place wlth a screw end 12 operating inthe screw-threaded end 14 of a plunger 13. The usual cap 15 is rovided.

'The plunger 13 as` it vmoves outwardly 1n the stem 1 is designed toindicate the pressure within the tube. Broadly this movable plunger isnot new. A spring 16 is secured to a threaded end 17 on the plunger. Theopposite end of the spring is screwed lnto an anchor plate 18. Theanchor plate 1s slightly larger than the interior chamber of Specicationof Letters Patent.

difficult tof avoid the flange 23 is prevented Patented Feb. 7, 1922.1920. serial No. 385,315.

the stem 1 and fits into a socket 19 in the end of the stem. A rubbertube 2O is secured' toa redfuced end 214 on means o a wrappi 22. Theinner end o thei tube 2O has anflgange 23 which extend loutwardly to asocket formed at the end of the stem 1 1n the opening 2a in the head 2.

T he anchor plate with its" spring end insertlon forms a cutting corner.`In order to protect the rubber at the junction of the flange and tube aflanged n1pple 24 is provided whlch has a tubular extension along therubber tube to a point within the spring 20 and antoutwardly extendingflange on whlch the rubber flange at the end of the tube rests. Thisflanged nipple protects the rubber and prevents its cutting at the pointof Juncture between the flange and tube. It w1ll be understood that thispoint is under s traln as the rubber tube is expanded with a movement ofthe plunger and that it is cutting the edges on the the plunger 13 byency for the rubber to expand inwardly and close. the opening to thedesirable to have the flange expand outwardly so .as to make a forced orpressed closure at lts outer periphery. To accomplish this I provide anipple 25 which extends upwardly into an opening 26 through the flange23 and into the tube 20. The nipple has an extending flange 27 whichforms a washer extending over the surface fof the flange 23, the washerhaving a key projeo tion 28 extending into a socket 29 in the head so asto prevent the turning of the washer with its engagement with a screw 30screwed into the screw-threaded opening 2*1 in the end of the head. 1 Itwill be readily seen that as pressure is put on the flange 23 throughthe action of the clamping screw 30 from expanding inwardly and closingthe opening and exp ands outwardly making a closure with the walls ofthe socket so as to sealv the entire. device. `The screw 30 has anopening 31 wihi'ch communicating with the nipple 25 makes a connectionthrou h to the interior tube. FurtherI it is 'of the tube 20 and the punger 13 has an I prefer to provide the usual transparent 'cap 32 whichis preferably formed of glass and arranged in a base 33. 'lhe base isprovided with a socket 34 with an upstanding thin lip The glass isarranged in this socket and provided with a groove 36. rlhe upstandinglip 35 is spun into this groove 36 so as to secure the glass to thebase. vrlhe socket 34 is of slightly larger diameter than the glass atthe base so that there is a space 36 left between the bottom of thesocket and the outer periphery of the glass at the base. ln this way theglass is subjected to the pressure of the thin lip only and consequentlyinjury to the glass through expansion and contraction of the metal ofthe base is avoided.

What l claim as newl is 1. In a tire gauge, the combination vof a hollowstem having its exterior screwthreaded, 'the screw threads beingextended throughout the major portion of the stem and to the inner endthereof; a head screwed on to the inner end of the stem; means forclamping a tire tube on the head; a ,plunger in the stem; an inflationvalve in the plunger; a spring secured to the plunger and at the innerend of the stem; an elastic tube secured to the plunger and having aflange positioned in the head at the end of the stem; and a screw in thehead clamping the flange.

2. In a tire gauge, the combination of a hollow stem having its exteriorscrewthreaded, the screw threads being 'continued throughout the majorportion of the length of the stem and to the inner end thereof; a headhaving a screw-threaded opening therethrough of uniform diameter screwedon to the inner end of the stem; means for clamping a tire tube on thehead; a plunger 1n the stem; an inflation valve in the plunger; a springsecured to the plunger and at the inner end of the stem; an elastic tubesecured to the plunger and having a flange positioned in the head at theend of the stem; and a screw in the head clamping the flange.

3. lln a tire gauge, the combination ofa hollow stern having itsexterior screwthreaded, the screw threads being extended throughout themajor portion of the stem. and to the inner end thereof; a head screwedon to the inner end of the stem; means for clamping a tire tube on thehead; a plunger in the stem; an inflation Valve in the plunger; a springsecured to the plunger and at the inner end of the stem; an elastic tubesecured to the plunger and having a of the flange.

4. ln a tire gauge, the combination of a 1stem having a head with asocket at its Aet inner end; a plunger arranged in the stern;

an inflation valve in the plunger; an elastic tube secured to theplunger and having a flange extending into the socket; a flanged nippleextending into the inner end of the tube, the flange of the nippleengaging the flange of the tube; and means for clamping the flange ofthe nipple against the flange of the tube.

5. ln a tire gauge, the combination of a stem having a head with asocket at its inner end; a plunger arranged in the stem; an inflationvalve in the plunger; an elastic tube secured to the plunger and havinga flange extending intothe socket; a flanged n1pple extending into theinner end of the tube, the flange'of the nipple engaging the flange ofthe tube; means for clamping the flange of the nipple against the flangeof the tube; and means for locking the flanged nipple against turning.

6. ln a tire gauge, the combination of a stem having a head at its innerend; a plunger in the stem; a spring secured to the plunger; an anchorplate into which the inner end of 'the spring extends; an elastic tubesecured to the plunger and arranged within the spring and having aflange at its inner end extending laterally past the anchor plate; and aflanged nipple on the tube between the anchor plate and the ange on thetube.

7. ln a tire gauge, the combinationof a hollow stem having its exteriorscrewthreaded, the screw threads being extended throughout the majorportion of the stem and to the inner end thereof; a head having ascrew-threaded opening through it, said stem being screwed partiallythrough the head leaving a screw threaded socket; means for clamp-ing atire tube to the head; a plunger in the stem; an ination valve in theplunger; an elastic tube secured to the plunger; and means for securingthe inner end of the tube, said means extending into said socket andcomprising a nut screwed into the threads of said socket.

lln testimony whereof ll have hereunto set my hand.

ll. PULVERMAN.

